矿井封闭火区热交换及启封时间研究

根据煤炭自燃放热和传热理论，当煤矿井下火区封闭后，封闭火区内生热和散热平衡系统遭到破坏，造成封闭火区内发生热量积聚现象。分析了热量通过粘贴在固体表面的静止流体微元层向封闭墙或煤层等多孔介质的热传递过程和热传递机理，建立了封闭火区内的热量传递模型和火区启封时间计算模型，导出了火区从封闭到启封的时间计算公式，并用实例进行了验算。

Study on heat transfer in close fire zone of coal mine

According to the theory of heat-releasing and heat-transferring of coal spontaneous combustion, after the fire-zone is closed under the coal mine, the balance system is destructed for heat generation and elimination in the fire-zone, and the heat quantity is accumulated in closing fire-zone.The heat-transferring course and mechanics are analyzed when the heat passes from the static fluid infinitesimal layer attached at solid surface to porous medium such as closing wall and coal seam. The heat-transferring model is set up in closing fire-zone, and the time-calculating model is also set up when the fire-zone is opened. The time-calculating equation is deduced from closing to opening for the fire-zone, and it is checked through the example.